| 摘要 |
PURPOSE:To provide an optical scanner which corrects non-periodic deviation of the position of a scanning line by separating the output value from a means for detecting the position of the scanning line to a periodic component value and non-periodic component value with respect to the period of a rotary polyhedral mirror. CONSTITUTION:The output P from a detector 53 for the position of a scanning line is inputted to a microprocessor 54 from which the control value S for a synthesizer 55 is outputted as a result of prescribed processing. An ultrasonic optical modulator (AOM) is driven by said output. The periodic component and non- periodic component are calculated from the average value of the detected position value of the scanning line of each mirror face (m) relating to the past r0 rotation in the microprocessor 54 and the interpolated approximate function in each picture element position is calculated from the non-periodic component array by using a Lagranges interpolation formula or the like. The control value S for the synthesizer is calculated from the value of the sum of the interpolated approximate function value corresponding to each scanning position obtd. by such calculation and the periodic component. |
